Improving Work Zone Safety for Freight Vehicles: Effective Design Patterns for Vehicle Mounted Attenuators

Bham, Ghulam H.; Leu, Ming C.; Mathur, Durga Raj; Vallati, Manoj · 2010 · ROSA P / Mid-America Transportation Center

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Summary

This study addresses the lack of specific guidelines for selecting color combinations and striping patterns for Vehicle Mounted Attenuators (VMAs) in highway work zones. While VMAs are known to reduce crash severity, existing standards like the Manual on Uniform Traffic Control Devices (MUTCD) do not prescribe specific markings. The research aims to determine which VMA designs most effectively alert drivers and induce lane changes, thereby preventing rear-end collisions. The study evaluates four common patterns: yellow/black inverted ‘V’, red/white checkerboard, orange/white vertical stripes, and lime green/black inverted ‘V’. The methodology combined a survey of 30 state Departments of Transportation (DOTs) with a controlled driving simulator experiment. The simulator study involved 120 participants across three age groups (18–34, 35–64, and 65+) driving through virtual work zones during daytime, dusk, and nighttime conditions. The primary objective metric was Lane Change Distance (LCD), defined as the distance from the VMA when a driver began steering to change lanes. Statistical analysis included Analysis of Variance (ANOVA), pairwise least-square means tests, and Kolmogorov-Smirnov tests to assess differences in LCD distributions. Subjective evaluations were conducted via post-experiment questionnaires where participants ranked the patterns based on visibility, attention capture, alertness, and contrast. Results from the DOT survey indicated that the yellow/black inverted ‘V’ pattern was the most widely used, largely due to supplier availability rather than performance data. In the simulator study, the red/white checkerboard pattern consistently demonstrated superior effectiveness. During daytime conditions, the red/white checkerboard and orange/white vertical stripe patterns produced significantly larger mean LCDs than the inverted ‘V’ patterns. During dusk, the yellow/black inverted ‘V’ was significantly less effective than the other three patterns, with the red/white checkerboard yielding the largest mean LCD. At night, no significant differences in mean LCDs were observed among the patterns. Subjective rankings aligned with objective data; participants preferred the red/white checkerboard pattern for visibility, attention capture, and contrast across all lighting conditions. The study concludes that the red/white checkerboard pattern is the most effective VMA marking for improving work zone safety. The findings suggest that current reliance on the yellow/black inverted ‘V’ pattern is suboptimal, particularly during dusk. The authors recommend that transportation agencies adopt the red/white checkerboard design to enhance driver recognition and reaction distances. This research provides empirical evidence to support updates to traffic control guidelines, potentially reducing crash frequency and severity in construction zones.

Key finding

The red and white checkerboard pattern was identified as the most effective VMA marking, demonstrating significantly better driver reaction distances during daytime and dusk compared to other patterns.

Methodology

simulator

Sample size: 120

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified_with_issues.

Topics

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• emergency work zone conspicuity
• vehicle conspicuity
• work zones
• perceptual countermeasures
• roadway lighting effects
• signage environment